28 ENTOMOLOGICAL SOCIETY 



Abdominal petiole quadrate or rounded; first two joints of flagel- 

 lum unequal 19 



18. Mandibles about four times as long as wide at base ; submedian cell 



shorter than the median Anomma Shuckard 



Mandibles much broader, at the most only three times as long as 

 wide at base. 



Submedian cell shorter than the median Dorylus Fabricius 



Submedian cell longer than the median Rhogmus Shuckard 



19. Mandibles broad, at the most not twice as long as wide at the base, 



20 



Mandibles narrow, about three times as long as wide at base. 

 Thorax with appressed pubescence above Typhlopone Emery? 



20. Thorax dorsally with an oblique, erect pubescence. 



Mandibles much narrowed towards apex and produced into a 



long point Dichthadia Gerstacker 



Mandibles not especially narrowed towards apex. A lao pone Emery 



Thorax dorsally without an erect pubescence, but with only a fine 



quite appressed pubescence Shuckardia Emery 



Subfamily III. ACANTHOSTICHIN^:. 



1893. 2tne Tribu: Cerapachysii Forel (partim) r Ann. Soc. ent. 



Belgique, xxxvn, p. 162. 

 1895- 3 Tribus: Cerapachyi Emery (partim), Zool. Jahrb. Syst, 



vni, p. 765. 

 1901. I Tribu : Acanthostichii Emery, Bull. Soc. ent. Belgique, 



XLV, p. 34 (Poneridse). 



This subfamily is undoubtedly closely allied to the next 

 family, or the Poneridae ; but on account of the male genitalia 

 being similar to the dorylid type I prefer to retain it in this 

 group. 



Representatives are known in North America, i. e. Texas, 

 Mexico, and Central America and in South America. The first 

 specimen I had seen of this curious group, Acanthostichus 

 kirbyi Emery, was kindly given to me by my friend, the emi 

 nent French hymenopterologist, Mr. Ernest Andre, of Gray, 

 France. This has aided me very materially in working out 

 the new genus characterized below : 



TABLE OF GENERA. 



1. Workers 2 



Females 3 



Males 6 



2. Mesonotal suture obsolete or very indistinct; head oblong, smooth, 



the sides nearly parallel ; frontal carinae with lobes that cover the 



